"The fate of many coal-fired power plants may rest on how boldly Obama tries to fulfill his pledge to cut greenhouse gas emissions."

"POOLESVILLE, Md. — On a curve of the Potomac River 37 miles northwest of Washington, the Dickerson power plant has stood sentry over small villages, crop fields and horse farms for more than half a century.

Burning mostly coal and some natural gas, Dickerson emitted about 1.5 million tons of greenhouse gases in 2011, akin to the pollution of about 275,000 cars.

How much longer Dickerson will run depends in no small measure on the steps President Obama takes to fulfill the pledge he made in his State of the Union address to tackle climate change. With chances for congressional action nil, the president will have to choose from a menu of administrative options, including new regulations."